Was at the range this weekend shooting my TC Black Mountain Mag. 50 1:28 twist with 2 pellets pyro (100g) and TC shockwave. My first shot out of clean barrel in the bullseye but subsequent shots wandered off. The guy next to me said this was probably due to plastic from the sabot filling the rifling. So after every shot I ran a brass brush thru. This solved the problem as subsequent shots were right on. Has anyone else had this problem. The same guy said Power belts would solve the plastic fouling problem. But don't Power belts have a plastic belt ? Any help would be greatly appreciated as usual.